Optical fiber pipeline security pre-warning system based on coherent rayleigh scattering

被引：4
作者：
An, Yang [1 ]
Jin, Shijiu [1 ]
Feng, Xin [1 ]
Feng, Hao [1 ]
Zeng, Zhoumo [1 ]
机构：
[1] State Key Laboratory of Precision Measurement Technology and Instrument, Tianjin University, Tianjin
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2015年 / 48卷 / 01期
关键词：
Coherent Rayleigh scattering; Distributed optical fiber sensor; Pipeline security pre-warning; processing; Signal;
D O I：
10.11784/tdxbz201308012
中图分类号：
学科分类号：
摘要：
The phase-sensitive optical time domain reflectometer(OTDR)is used in oil and gas pipeline safety monitoring. In this paper, the detection principle of the pipeline security pre-warning system based on coherent Rayleigh scattering was firstly analyzed, and the corresponding relationship between the interference light intensity and the optical fiber refractive index is derived, which proved the feasibility of the system. A new signal processing scheme was then proposed, which processed the signal from both space and time domains. In space domain, an interval parameter was introduced into the traditional moving averaging algorithm so as to improve the SNR of the signal and reduce the system computation amount. Besides, the time-domain signal corresponding to the intrusion position was extracted, and the time-domain characteristic of intrusion signals was demonstrated through time-frequency analysis and wavelet filtering method. The field experimental results show that the system can effectively detect and precisely position external vibration events. The SNR of differential signal can be as high as 7.8, dB, and the standard deviation of positioning results is less than 10, m. ©, 2015, Tianjin University. All right reserved.
引用
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页码：70 / 75
页数：5
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